The Amp safe protection unit is a plug-in, direct replacement trip unit for Merlin Gerin, Schneider Electric Masterpact MP, & Klockner Moeller IZM, IEC, or UL rated Breakers.

The Amp safe protection unit does not use rating plugs and are user programmable to replace any versions of the STR 18M, 28D, 38S, 58U.

The Amp safe protection unit has the same protective functions, settings and time-current-curves as the original STR units.

Amp Safe Pro

UL and CE Certification

To ensure that the Amp Safe Protection Unit will function when needed the Amp Safe Protection Unit was tested to the ANSI C37.59 Standards for fault interruption. As a result of this testing the Amp Safe Protection unit is UL certified. This makes the Amp safe protection unit the only Masterpact replacement trip units that are UL listed.

The Amp safe protection unit also carry the CE mark.

UL and CE

Standard trip functions include:

(These will vary depending on the STR type selected)

  • Long-Time
  • Short-Time
  • Instantaneous
  • Residual Ground Fault
  • Ground Return Ground Fault
  • Instantaneous on Closing
  • Over Temperature Trip

All of the settings are protected by a security code to prevent unauthorized modifications.

Additional Functions:

Sluggish Breaker Detection

The Amp safe protection unit has the ability to detect if the Masterpact breaker mechanism needs service. The first time a breaker opens after a long period of inactivity it may open slowly. This can be caused by mechanical issues, poor lubricant or other obstructions. 

The Amp safe protection unit will capture the sluggish breaker event and display a warning on the screen the next time it is powered up. An external alarm can also be activated when the Amp safe protection unit detect a sluggish breaker event.

USB Port

The front mounted and electrically isolated USB port allows for easy downloading of trip data and protection settings. It can also be used to upload the trip unit settings, making commissioning the trip unit much faster. The USB port can also be used with the SAFE-T-TRIP system. 

Programming

The Amp safe protection unit can be programmed one of two ways. The front of the unit has an OLED display that is easy to read in either low or high ambient light. The buttons on the front of the unit are “smart” buttons that change their functions based on the displayed information. The second way to program the Amp safe protection unit is using the USB port on the front to connect to the InfoPro-MP software application. The program makes it very easy to commission the Amp safe protection unit.

The Amp safe protection unit has a mechanical pop out trip indicator on the front of the unit that mimics the functionality of the original unit.  There is also a SELF-TEST OK Led, PRE-TRIP LED, QUICK-TRIP switch and an easily accessible LI-Ion battery. The SELF-TEST OK LED indicates a properly operating trip unit. The PRE-TRIP LED indicates a pending trip.  The QUICK-TRIP switch activates QT-Instantaneous and QT-Ground Fault settings in the trip unit to reduce arc flash hazard. 

The battery in the Amp safe protection unit is only used to power the trip unit to review trip data or change settings when no power is provided from the CT’s.  The battery is not used for any of the protective functions.  The battery is also not used to save the last trip data or settings.  All of this data is saved in non-volatile memory.